Mitsunari Tokugawa, the 13th patriarch of the Tokugawa clan and a direct descendant of Mito Koumon, commands the clandestine Underground Arena beneath Tokyo Dome with ironclad authority. At 80 years old, his diminutive frame—147 cm and 50 kg—belies a ruthless intellect. Bald, with grey, protuberant eyes, he dons traditional kimonos, their hues shifting across adaptations, flanked by vigilant bodyguards like Shuumei Kanou. As "Gorōkō," he orchestrates no-holds-barred clashes between fighters of every discipline, manipulating rules to escalate carnage—permitting weapons, intimidating medics—yet never stepping into the fray himself. His chilling detachment borders on sociopathy, exemplified by pitting the primal Pickle against Musashi Miyamoto, disregarding scientific stakes. Yet flashes of remorse surface: he wept after Doppo Orochi’s near-fatal duel with Yuujirou Hanma and bore guilt for Retsu Kaiou’s weapon-induced demise. Strategically cunning, Mitsunari once subdued the invincible Yuujirou via snipers armed with blue whale tranquilizers, a singular humiliation. His web of influence spans prime ministers, General Gerry Strydum, and warriors like Doppo, cultivated through tea parties dissecting martial philosophy and scouting talent. Mitsunari’s legacy intertwines with seismic events: recruiting Baki Hanma post-bodyguard defeat, launching the globe-spanning Maximum Tournament, and choreographing Yuujirou’s brutal spectacles. He halted Pickle’s cannibalistic rampage, only to later enable his clash with Musashi—a paradox of controlled chaos. Though non-combatant, his shadow looms over every arena duel. Personal ties—sister Sabuko, father Mitsunobu, pet Noro—remain peripheral, eclipsed by his role as puppet master of history’s fiercest battlegrounds.